<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<html>
<head></head>
<body>
<c:choose>
    <c:when test="${empty param.username}">
        unknown user.
    </c:when>
    <c:when test="${param.username == 'itcast'}">
        ${param.username} is a manager.
    </c:when>
    <c:otherwise>
        陈煜202212390606 you are a manager
    </c:otherwise>
</c:choose>
</body>
</html>